Electric tube



Jan. 19; 1932. c. F. w. BATES ELECTRIC TUBE Filed Nov. 7, 192

awumdoz 'C'HHRLEE wwwarss low body made ofglassiorvitreous material,- elem 12*, connected 'to metal sleeve and an elementor partfma'de of; metalr whic, wXteiidsj'?axially 0f: the:glass body walls to glass without fracture or breakage.

V vised a structure in which inexpensive metals Y may be had to the single figure in the accom-f i drical body 2-Inade of glass which is closed at one end and includes a central supporting 1 istics are employed to avoid oxidation and "matic view and sectional elevation of apower V practices to permit. thet'ubeto be exhausted Patented-Jan; 19, 1932 Y Est emST Application filed hT dvenilier j The present invention pertains to an improvement in electric lamps, radiantenergy tubes, and: other devices wheremedaermet V p p v p p merit 2 1s included; f In the'presentstructure caliy sealed union is required between a 1101- Broadly speaking it isanold' practice in the! art of making-electric lamps andtubes to Weld tubular elements of metal liavlngthln and With hermetical sealing: effect, using platinum for the purpose. However, platinum is an expensive metal toemploy', espe cially; where large areas and quantit esnof that metal are involved. I havetherefor'edesuch ascopper and nickel or iron may be used with satisfactory results, in which. special Y. provision'is made to permit an effective welded union to be producedbetween a glass body and-a thin copper tube of uniforln'thickness throughout its length, in which'theglass body if is supported with slightly yielding efi'ect, in which a glass skirt or extension is provided to prevent the seal from cracking, and in. which metals of'difierent properties and character-i sealingof the metal and-ohjecticnaldeposits 7 thereof within the glass body and upon any electric conducting element or electrode eonfined therein. This improved structure may be incorporatedin varioustypes oflamps and tubes, andtherefore-I do not wishto limitits adaptation and use to any particular'typeL But to exemplify oneelectricalappliance in which the invent-ion maybe utilized reference panyin'g drawing, which figure is a diagram-I.

tube embodying my improvement. l i

This power tube comprises a hollow cylinportion orstem 3 for an electric current conducting filament 4. A lateral branch 5 also' forms part of glass body 2"tl1rough which a conduct-or or terminal 6lfor a grid element extends'blThese filament and o-grid leads are sealed in theglass walls according'to known ATES or onEvnnANn,; o iq..

"through a reduced cylindrical neck or ext'en Si n 9 thereofi Theproduction of this arti' j cle -involves the lieatingof the glass toa high: temper ture 1 ed the sealing of the "glass' to '*thevmetaljsleevedirectlylat neck QEf'As' p I i ly stated I'may 1, useai platinum' slev'e', i

the presentstructure, can employ "instea'd' ashorttubeforsleeve lO of jcopper, v vvueing- {a known composition of guss-iwhph} 'x-pfermitsa sealingfuniQn-tobe madewithcop}:

PrlTThesealingl'unionfiorjointinvolvesa: p i {substantial iareafof-t-hemeetingfzt'eeorsu g 1 'faces 'ofthe. glass andco per;"a d{weffect' a 16f the" tube iorleeve I0, is l0 5 but 'Wll] end to en's;

' that the surface 1 union ofthe i glasstii the cylindrical wall 10f: tuheforisleev'e 10 is w'ith a thinwallofthesamethickness at all'points .andtliat the unio'nQi-sonly made annularl-y at the middle of thetu'be or sleeve. I A s one result a'secureunionjmay beohtained and a perfect seal effectednotwithstanding that onewalPis of glass andthefqther of metarhaving a dif-1 i ferent coe'fiicient off'expan'sion; i v To avoid cracking 'of the seal th'e, glassneeki Q-is also continued l tor e'zxtend'ed downwardly apart from the lower; depending end oiituh;v 1 eev ilwp efe b yinithe$6 31 f t. flare or be l-111 5 he p'pi e 30 the. .-;cqp er 1eevef10 is sleeved iupongand welded to an 'annular.enlargement on a; second a tube 12 made "of; nickel,'iron, steel, bro her Y metal, plated-or unplated; A "handor-collar- 11'- 14; made of nickel,'iron, -fsteel for other metal, f is sleevedover and welded to the upper'end -l,

a of the copper tube orsleevelO soIthatf f V i p, Furthermoretubeorsleeve "I 10 isf-relatively longerthafi theneck orir 'dnced part of the glass body andso disposed inre'spec-tjtherjeto-that the innerlendj a of I th'etube-e 'xtends ashortdistanceintothehol is'tance belowand the copper Will'be completelyenclo'sed or covered within theevacuated chamber, the purpose being toprotect the parts and surfaces Within .the device from oxidizing effects, and depositing of free metal within the evacuated chamber. The inner tube 12 may j be reduced in diameter for a part of its length to provide an annular air space 15' around the middle part of sleeve 10 opposite the glass 7 I neck and seal,'and the lower end of the sleeve is spaced apart or fr'eelymounted upon the inner tube 12to permit expansion andcon- U traction of the sleeve ineffecting a sealing union, and toyieldingly support the glass body. From the, foregoing it becomes obvious that theglass body'2 is yieldingly supported by the thin walled copper sjleeve or tube 10, which in turn is supported by the upper end of a second tubular piece or part 12 closed or sealed to theatmosphere. As

shown member 12 projects downwardlyfrom sleeve 10 in the form of a hollow cylinder or shell, the length of which is such that it may contain the filament and grid and be readily confined Within a- Water cooling jacket 17.

vOther cooling means maybe introduced on f i provided, and theshape or form of the inner I tube or plate 12 maybe considerably modified without making any essential change in the sealing structure. ccordingly the present improvement is not confined to the exact structural form of plate memberused, norto the cooling means shown. Furthermore, the

hollow part ofthe glass body and the various elements thereinmay also be constructed in other ways than as-shown without departing 7 from or affecting the improvement embodied in the sealing union herein described.

That I claim, is:' i

1. As an article of manufactureandsale, a hollow body of vitreous material, a metal sleeve extending-into and welded directly in sealing union with said hollow body, a metal tube member extending'into'said sleeve and welded to one end thereof and a collar welded to said sleeveat the welding zone of sai metal tube member and said sleeve.

2. As an article of manufacture and sale,

,a hollow body of vitreous material having a neck, a copper sleeve welded to said neck and extending into said hollow body, a metal tube closed at one end and welded at its open 7 end tothe sleeve extension, and 'a band weldedto and covering said extension of said sleeve atitsi welding zone with said metal tube. I

In v ,1 CHARLES BATES testimony'whereof I aflix signature; 

